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Three-dimensional finite element simulation of intrusion of the maxillary central incisor

Ryniewicz W., Ryniewicz A. M., Bojko Ł., Pełka P., Filipek J., Williams S., Loster B. W.

Biocybernetics and Biomedical Engineering

2016

Vol. 36, no. 2

385--390

Purpose: The aim of this study is to generate a global digital model of treatment, analysis of stress distribution and displacements: in a construction of the bracket, in the incisor with bonded bracket, in tissues of the incisor, in a periodontal membrane and in an alveolus. Methods: An orthodontic therapy was provided with a three-dimensional model of a unique Cannon Ultra bracket. The placement of the bracket to the incisor was provided according to clinical standards. Composite material was placed between the rough surface of the bracket's base and labial incisor surface – which, in a digital model, resulted in contact without displacement. The bracket was loaded. An orthodontic arch wire was free to move in a wing slot of the bracket. For simplification, a force vector was parallel to the longitudinal axis of the incisor. A clamper was set on the surface of the cortical bone of the alveolus. The model was divided into a finite number of tetrahedral elements. To calculate the distribution of stress Ansys Workbench software was used. Results: The stress values indicate that there were no tissue overloaded areas. The stress distribution was regular in the periodontal ligament. Slight movements were observed with maximal values in the area of apex. Conclusions: This study simulation proves that tissues surrounding the tooth were influ-enced mechanically by the force loaded on the bracket. [...]

Recykling odpadowych poliolefin przez intruzję : wtłaczanie do formy

Pietruszka A., Krasuska A., Romanowski M.

Przemysł Chemiczny

2014

T. 93, nr 12

2181-2184

Przedstawiono podstawy procesu przetwórstwa odpadowych tworzyw sztucznych przez wtłaczanie do formy (intruzję) oraz dokonano przeglądu urządzeń stosowanych w tym procesie.

Fundamentals and a brief review, with 19 refs., of uses and equipment for intrusion of plastic wastes.

Determination of limit pore size distributions of porous materials from mercury intrusion curves

Cieszko M., Kempiński M.

Engineering Transactions

2006

Vol. 54, iss. 2

143-158

The application of the capillary and chain models of pore architecture are proposed in the paper for determination of limit pore size distributions of porous materials based on the mercury intrusion curves. They estimate the range of pore sizes in the investigated material. It is proved that for a given pore size distribution, the capillary model of pore architecture, commonly used in the mercury porosimetry, and its chain model, are two limit cases of the network model of pore architecture, considered in the paper as a proper model for most real porous materials. For both limit pore architectures, the expressions describing capillary potential curves have been derived that are the basis for the procedure of determination of two limit pore size distributions. This procedure has been illustrated by determining the limit distributions for porous materials made of sintered glass beads.